JPH04345788A - High frequency heating device - Google Patents

Abstract

PURPOSE:To uniformly expand high frequency into a heating room and improve heating irregularity by supplying high frequency, guided to the lower part of the heating room through a wave guide, from a supply port to the center of the room. CONSTITUTION:High frequency generated from a magnetron 10 is guided to an antenna 14 at the upper part of a heating room through a wave guide 12 and radiated into the heating room 1, while high frequency generated from a magnetron 11 is guided to the opening 15 at the lower part of the heating room and radiated from a supply port 15 to the center of the heating room, in the direction of B. The frequencies are radiated from the rotary antenna 14 and the supply port 15 in the direction of arrow marks A, B to allow the high frequencies to be expanded into the heating room all over, resulting in heating irregularity improvement and higher heating efficiency.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to high frequency heating devices such as microwave ovens.

0002

2. Description of the Related Art FIG. 4 shows a microwave oven disclosed in Japanese Utility Model Publication No. 59-34073. Rotating antennas 21 and 22 are provided near the center of the top and bottom inside the heating chamber 20, and a magnetron 23, which is a high frequency generating means, is installed from the tips of these antennas.
, 24 radiate high frequency waves generated into the heating chamber 20.

Although such a configuration is quite effective in improving heating unevenness, a closer look shows that the high frequency waves radiated from each of the rotating antennas 21 and 22 are directed toward the side wall of the heating chamber as shown by the arrows. Relatively strong. Therefore, heating unevenness cannot be sufficiently improved.

0004

SUMMARY OF THE INVENTION The present invention aims to significantly improve heating unevenness in a structure in which high frequency waves are radiated into a heating chamber from above and below.

[0005]

[Means for Solving the Problems] The high-frequency heating device of the present invention has a first configuration including a heating chamber, a turntable arranged at the bottom of the heating chamber for rotating food, and supporting the periphery of the turntable. a roller that supports the roller, a metal roller support that supports the roller, a high frequency generating means, and a rotating antenna that is disposed above the heating chamber and radiates high frequency waves generated by the high frequency generating means into the heating chamber;
a waveguide means for guiding the high frequency waves generated by the high frequency wave generating means to the lower side of the heating chamber; and a high frequency supply section that supplies high frequency waves into the heating chamber.

The second configuration includes a heating chamber, a turntable accommodating recess formed in the bottom wall of the heating chamber, a turntable disposed within the recess for rotating food, and high frequency generating means. a rotating antenna disposed in the upper part of the heating chamber and radiating the high frequency waves generated by the high frequency generating means into the heating chamber; and a waveguide means guiding the high frequency waves generated by the high frequency generating means to the lower side of the heating chamber; A high frequency supply section is formed on a side wall of the recess and supplies high frequency waves guided by the waveguide into the heating chamber.

[0007]

[Operation] In both the first and second configurations, high frequency waves are evenly spread within the heating chamber.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show the structure of a microwave oven according to a first embodiment of the present invention. Reference numeral 1 denotes a heating chamber, 2 a recess for accommodating a turntable formed in the bottom wall 3 of the heating chamber 1, and 4 a dielectric accommodating recess formed in the bottom wall 3 of the heating chamber 1, which is disposed in the recess 2 and rotates the food. Body-made turntables 5, 5... are resin rollers that support the periphery of the lower surface of this turntable 4;
Reference numeral 6 denotes a roller support body that supports these rollers, and this support body is made up of metal roller shafts 7, 7, . . . and a metal ring body 8 that connects these roller shafts. 9 is a motor that drives the turntable 4; 10 and 11 are first and second magnetrons that generate high frequency waves; and 12 and 13 are first and second magnetrons that guide the high frequency waves from these magnetrons to the upper and lower sides of the heating chamber 1. A second waveguide 14 is the heating chamber 1
15 is a bottom wall 3 of the heating chamber 1;
This is a high frequency supply port that is formed closer to the center of the heating chamber than the support 6, that is, inside the support 6, and supplies the high frequency waves guided by the second waveguide 13 into the heating chamber 1. The distance L between the turntable 15 and the turntable 4 is set to approximately an odd multiple of λ/4, specifically, λ/4, where λ is the wavelength of the high frequency.

In such a configuration, the high frequency waves radiated from the rotary antenna 14 are relatively strong toward the side wall of the heating chamber as shown by arrow A, but the high frequency waves radiated from the supply port 15 are directed toward the side wall of the heating chamber as shown by arrow B. The high frequency waves are relatively strong toward the center of the heating chamber, so that the high frequency waves are evenly spread throughout the heating chamber 1, and uneven heating of the food is significantly improved. Furthermore, the high frequency from the supply port 15 is inside the support body 6 consisting of the metal roller shafts 7, 7, . The food on the turntable opposite is efficiently heated. Moreover, since the turntable 4 is located at a position of λ/4 with respect to the supply port 15, the food on the turntable is exposed to high frequency waves with a strong electric field strength, thereby achieving more efficient heating.

FIG. 3 shows the structure of a microwave oven according to a second embodiment of the present invention. The same parts as those in the first embodiment will be denoted by the same reference numerals and the explanation thereof will be omitted, and only the different parts will be explained.
A high frequency supply port 15 for radiating high frequency waves guided by the second waveguide 13 into the heating chamber 1 is formed in the inclined side wall 16 of the recess 2, and this supply port 15 is closed with a lid 17 made of resin. ing.

In this case, the high frequency waves radiated from the rotating antenna 14 are relatively strong toward the side wall of the heating chamber as shown by arrow a, and the high frequency waves radiated from the supply port 15 are efficiently directed toward the center of the heating chamber as shown by arrow b. This is relatively strong, and accordingly, the high frequency waves are evenly spread throughout the heating chamber 1, and uneven heating of the food is significantly improved. Furthermore, since the supply port 15 is located on the side wall 16, even if food spills inside the heating chamber 1, it is unlikely to leak out from the supply port 15.

0012

According to the present invention, in the configuration in which high frequency waves are radiated into the heating chamber from above and below, the high frequency waves can be spread evenly within the heating chamber, and heating unevenness can be significantly improved.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a microwave oven according to a first embodiment of the present invention.

FIG. 2 is a plan sectional view of the microwave oven with the turntable removed.

FIG. 3 is a front sectional view of a microwave oven according to a second embodiment of the present invention.

FIG. 4 is a front sectional view of a conventional microwave oven.

[Explanation of symbols]

1 Heating chamber 2 Turntable housing recess 4 Turntable 5 Roller 6 Roller support 10 First magnetron 11 Second magnetron 12 First waveguide 13 Second waveguide 14 Rotating antenna 15 High frequency supply port

Claims (2)

[Claims] Claim 1: A heating chamber, a turntable arranged at the bottom of the heating chamber for rotating food, a roller supporting the periphery of the turntable, a metal roller support supporting the roller, and a high frequency generator. means, a rotating antenna disposed at the upper part of the heating chamber for radiating the high frequency waves generated by the high frequency generating means into the heating chamber, and a waveguide for guiding the high frequency waves generated by the high frequency generating means to the lower side of the heating chamber. and a high frequency supply section that is formed on the bottom wall of the heating chamber closer to the center of the heating chamber than the roller support and supplies high frequency waves guided by the waveguide into the heating chamber. 2. A heating chamber, a turntable accommodating recess formed in the bottom wall of the heating chamber, a turntable disposed within the recess for rotating food, and high frequency generating means;
a rotating antenna disposed in the upper part of the heating chamber and radiating the high frequency waves generated by the high frequency generating means into the heating chamber; and a waveguide means guiding the high frequency waves generated by the high frequency generating means to the lower side of the heating chamber; formed on the side wall of the recess,
A high-frequency heating device comprising: a high-frequency supply section that supplies high-frequency waves guided by the waveguide means into the heating chamber.